Your 2012 Mazda 3 deserves a K&N! Select the Product Info button below to see everything the air filter fits.

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2012 Mazda 3 2.2L L4 Diesel - All ModelsAutomotive

This is my third (2 motorcycles 1 car) K&N air filter and with that said, I am a believer in your product.
I just installed the 33-2293 in my Mazda3 that I bought new back in 2008. While I only drive 9 miles a day I do drive it as Mazda intended Zoom-Zoom.
From the moment I pulled out the drive way I noticed a big difference in throttle response and my old air filter wasn't even dirty enough to warrant the upgrade.
Thank you for a fine product.
PS: Just bought a new Mazda CX5.... What kind of air filter do you think I'll be putting in it???